In small bowl, mix flour, sugar and baking soda together with whisk. Set aside.
In a 12oz or larger coffee mug, heat coconut oil in microwave for 15-20 seconds until fully melted.
Add egg white, milk and vanilla extract to melted coconut oil.
Add dry ingredients to wet ingredients in coffee mug and mix well, scraping sides as needed to make sure all flour is thoroughly mixed. Mix in berries.
Heat for 90-120 seconds, depending on your microwave’s power.
Remove from microwave and top with additional berries and a light dusting of powdered sugar, if desired. Enjoy immediately!